hey guys whats the best high flow cats to use? like what will give u the highest hp increase (i know its not much) but just wondering whats the best....oh and i talked to one of my dads friends he owns the local exhaust shop in town and he wants to build a custom exhaust with high flow cats a magnaflow x pipe and slp loudmouth mufflers and dual tips all in 3 inch...so it should be pretty badass for horsepower and sound !

 

You're best bet on highflow cats is going to be a metallic highflow cat either from Random Technology or Magnaflow.

 

whats better though

 

They're both the same design. A metallic high flow cat is going to give you the best flow, it's just a matter of which brand you like better.